>>105907505
Many B850 boards provide a PCIe Gen 5 x16 lane for the video card, even if it's not required in the chipset specs.
There's also a PCIe Gen 5 x4 lane for the M.2 slot.
https://www.amd.com/en/products/processors/chipsets/am5.html

You lose less than 2~3% performance if your PCIe Gen 5 video card needs to run on a Gen 4 x16 lane.